Spa tub



FIG. 1 is a front perspective view of a salon foot spa illustrating my design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a side elevation view of the salon foot spa shown in FIG. 1;

FIG. 5 is an opposite side elevation view of the salon foot spa shown in FIG. 1;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing spa fixtures are for the purpose of illustrating environmental structure only and do not form part of the claimed design. 

The ornamental design for a spa tub, as described and shown. 